Name of the Organization : Haryana Public Service Commission
Name of the Exam : HCS (Ex.Br.) Main Exam
Subject : Mechanical Engineering
Document Type : Previous Question Paper
Year : 2014
Website : http://hpsc.gov.in/en-us/
Download Sample/Model Question Paper : https://www.pdfquestion.in/uploads/11141-Mechanical.pdf
HCS Main Exam Mechanical Engineering Question Paper :
Mechanical Engineering :
Time : 3 Hours
Max.Marks : 150
Related : HPSC HCS Main Exam Law Question Paper : www.pdfquestion.in/11135.html
Note:
** Attempt five questions. All questions carry equal marks. Question number I is compulsory.
** Answer any two questions from part I and two questions from part II.
** The parts of the same questions must be answered together and must not be interposed between answers to other questions.
** In case of any discrepancy in the English and Hindi versions, English version will be taken as final.
1. Write critical notes on any four of the following: (4X7= 28)
(a) Steering Gear Mechanism
(b) Allotropic forms of Pure lron
(c) Stirling Cycle with p-v and T-s diagrams
(d) Mohr’s Circle
(e) Routing, Scheduling and Dispatching
(D Supercharging of LC. Engines
Part -I :
2. (a) What are different types of Governors. Explain Sensitiveness, Hunting and Isochronism of Governors.
(b) Write Short notes on
I. PERT
II. CPM
III. ERP
3. (a) Draw the diagram of stress/strain for mild steel and Cast Iron and specify all the terminology related to stress/strain curve for mild steel.
(b) Distinguish between:
I. Resilience and Toughness
II. Malleability and Ductility
III. Endurance Life and Endurance Strength
4. (a) Draw the iron carbon diagram, and define the Eutectic and Eutectoid equation
(b) . Define Natural Frequency, Resonance, Time Period and Crtitical Speed of Shaft.Find the natural frequency of spring mass system shown in fig below
5. (a) Explain different types of Governing of I.C.Engines. Write briefly about the Rating of S.l and C.l Engines Fuels.
(b) Derive an Expression for LMTD for a heat exchanges and what is its significance
6. (a) i. Write the statement of Kelvin Planck and Clausius.
ii. In a steady-flow adiabatic turbine, the changes in the intemalenergy,enthalpy, kinetic energy and potential energy of the working fluid, liom inlet to exit, are -100 kJ/kg, -140 kJ/kg, -10 kJlkg and 0 KJ respectively. Find the amount of work developed by the turbine?
(b) i. Write short notes on Energy, Entropy, Enthrall.
ii. 85 kJ of heat is supplied to a closed system at constant volume. During the next process, the system rejects 90 kJ of heat at constant pressure while 20 kJ of work is done on it. The system is brought to the original state by an adiabatic process. The initial internal energy is 100 kJ. What is the quantity of work transfer during the process?
Civil Engineering :
I . A cantilever’ bean of tubular section consists of 2 materials. copper as outer cylinder and steel as inner cylinder. It is subjected to a temperature rise of 20oC and The stresses developed in the tribes’ will be
(A) Compression in steel and tension in copper
(B) Tension in steel and compression in copper
(C) No stress in both
(D)Tension in both the materials
2. For ductile materials, the most appropriate failure theory is
(A) Maximum shear stress theory
(B) Maximum principal stress theory
(C) Maximum principal strain theory
(D) Shear strain energy theory
3. Consider for following statements The principle of superposition is applied to l. Linear elastic bodies 2. Bodies subjected to small destinations Of these statements
(A) I alone is correct
{B) I and 2 are connect
(C) 2 alone is connect
(D) Neither I nor 2 is correct
4. The limit of proportionality is applicable more in the case of
(A) Concrete
(B) Wood
(C) Cast iron
(D) Mild steel
5. According to Tresca, yield locus is a,/an.
(A) Rectangle
(B) Circle
(C) Hexagon
(D) Ellipse
6. A horizontal beam is hinged at ‘R’ and supported on rollers at the end ‘S’. It canines inclined loads. To determine the support reactions. the funicular polygon.
(A)Must start only from the support ‘S’
(B) Must start only from the support ‘R’.
(C) Could start from any where on the vertical line through ‘S’.
(D)Could start from any where between ‘R’ and ‘S’.
7. For a given system of coplanar forces if the pole ‘O’ of the force polygon moves along a straight line OP, then the sides of the funicular polygon would rotate about fixed points all of which line
(A) A straight line parallel to oP
(B) A circle with centre,ar o
(c) An ellipse with oP as the major axis
(D) A circle with centre at p
8. Consider the following statements:
l. The intersection of the first and last ray in funicular diagram is on the line of action of the resultant
II. Intersection of first and last ray in polar diagram gives the magnitude of the resultant. Of these statements.
(A) Both I and II are true
(B) I is false but II is true
(C) I is true but II is false
(D) Both I and II are false
9. In a closed-coiled helical spring subjected to an axial load, other quantities remaining the same. if the wire diameter is doubled, then the stiffness of the spring when compared to the original one.-will become
(A) Twice
(B) Four times
(C) Eight times
(D) Sixteen lines
10. For the coplanar concunent system of forces as shown in the given figure systems will be
(A)In equilibrium if F1 = l0 Kn
(B)In equilibrium if F2 = l0 v2kN
(C) In equilibrium if F3 = 20 kN
(D) Will not be in equilibrium whatever be the magnitude of F3